See Ariana Grande Kill It at the Billboard Music Awards

Iggy Azalea was there too.

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Ariana Grande performed her hit "Problem" on Sunday at the Billboard Music Awards, and it was ***flawless. Iggy Azalea stopped by in a cheerleader outfit to do her guest verse (after doing her own hit "Fancy" with Charli XCX). If you did not know before that "Problem" would be the song of the summer in 2014, now you do.